Adds token refs #622

Author: JJ

doc/Language/glossary.pod6

@@ -1098,6 +1098,10 @@ L<Exegeses|#Exegesis>.
 L<#IRC> screen name for L<#Larry Wall>, creator of Perl. The name comes from
 the pronunciation of L<#TIMTOWTDI> as a word.
 
+=head1 token
+
+In this context, a L<C<token>|/syntax/token> is a regex that does not backtrack. In general, L<tokens|https://en.wikipedia.org/wiki/Lexical_analysis> are extracted from the source program while L<#Lexing>.
+
 =head1 Thunk
 X<|Thunk>